Web hosting unlimited bandwidth - 218 Part II . Running the Show Until
218 Part II . Running the Show Until recently, the United States government was standardized on a symmetric encryption algorithm called DES (Data Encryption Standard) to secure important information. There s no direct way to crack DES-encrypted data, so to decrypt the data without a password requires an unimaginable amount of computing power to try to guess the password the brute force method of decryption. As personal computing power has increased nearly exponentially, the DES algorithm has had to be retired. In its place, after a very long and interesting search, the U.S. government has accepted the Rijndael algorithm as what it calls the AES (Advanced Encryption Standard). Although the AES algorithm is also subject to brute-force attacks, it requires significantly more computing power to crack than the DES algorithm does. Go to http://aescrypt.sourceforge.net/ for more information on AES, including a command line implementation of the algorithm. Public-Key Cryptography Public-key cryptography does not suffer from key distribution problems, and that is why it is the preferred encryption method for secure Internet communication. This method uses multiple keys (usually two), one to encrypt the message and another to decrypt the message. The key used to encrypt the message is called the public key because it is made available for all to see. The key used to decrypt the message is the private key and is kept hidden. Say, for example, that you want to send me a secure message using public-key encryption. Here s how the process works: 1. I must have a public and private key pair. Depending on the circumstances, I may generate the keys myself (using special software) or obtain the keys from a key authority. 2. You want to send me a message, so you first look up my public key (or more accurately, the software you are using looks it up). 3. You encrypt the message with the public key. At this point, the message can only be decrypted with the private key (the public key cannot be used to decrypt the message). 4. I receive the message and use my private key to decrypt it. Secure Socket Layer A classic implementation of public-key cryptography is with SSL (secure socket layer) communication. This is the technology that enables you to securely submit your credit card information to an online merchant. The elements of an SSL encrypted session are:
Searching for affordable and reliable webhost to host and run your web applications? Go to our java web server services and you will be pleased.